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Journal articles
Beyond y-Al2O3crystallite surfaces: The hidden features of edgesrevealed by solid-state1H NMR and DFT calculations
Abstract : Elucidating the nature of high surface area gamma alumina sites is of great interest for numerous catalytic applications. In this work, the structural and spectroscopic features of edge sites are unravelled thanks to density functional theory (DFT) calculations combined with high field 1H MAS NMR of two high surface area alumina samples exhibiting distinct morphologies. DFT chemical shift calculations were carried out for relevant surface models with different hydration degrees. However, the best assignment is achieved by considering the first DFT model representing the hydroxylated edges located at the intersection of (1 1 0) and (1 0 0) alumina facets. The sharp 1H NMR peak at 0 ppm corresponds to µ1-OH groups which are located on this edge and are free from hydrogen bonding. Moreover, we show that these edge sites are the most reactive with respect to chlorine exchange.
Cited literature [47 references]
https://hal-ifp.archives-ouvertes.fr/hal-02333915
Contributor : Catherine Belli Connect in order to contact the contributor
Submitted on : Tuesday, October 29, 2019 - 11:46:07 AM
Last modification on : Friday, May 7, 2021 - 1:58:04 PM
Long-term archiving on: : Thursday, January 30, 2020 - 1:28:01 PM
Contributor : Catherine Belli Connect in order to contact the contributor
Submitted on : Tuesday, October 29, 2019 - 11:46:07 AM
Last modification on : Friday, May 7, 2021 - 1:58:04 PM
Long-term archiving on: : Thursday, January 30, 2020 - 1:28:01 PM